809900 divided by 80 
We're looking to find how many times 80 goes into 809900.

On to step 1:
The number 80 fits into 8 0 times, leaving a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Fetch the next digit (0) from the dividend, attach it to 8 and continue: 80 / 80

Advancing to step 2:
80 goes into 80 1 times with a remainder of 0.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we subtract 80 from 80, we get 0.
Grab the next digit (9) from the dividend, add it to 0, then carry on: 9 / 80

Advancing to step 3:
80 can be fit into 9 0 times, resulting in a remainder of 9.
The next digit of our result is 0. 
Result so far: 10.0
Subtracting 0 from 9 leaves us with 9.
Append the next digit (9) from the dividend to 9 and continue with: 99 / 80

Advancing to step 4:
80 can be fit into 99 1 times, resulting in a remainder of 19.
The number 1 becomes the next digit in our result. 
Result so far: 101.0
If we take 80 away from 99, we end up with 19.
Take the next digit (0) from the dividend and append it to 19, then repeat: 190 / 80

Advancing to step 5:
If we divide 190 by 80, we get 2 and a remainder of 30.
Write down 2 as next digit of the result. 
Result so far: 1012.0
Deduct 160 from 190 and we're left with 30.
Grab the next digit (0) from the dividend, add it to 30, then carry on: 300 / 80

On to step 6:
80 goes into 300 3 times with a remainder of 60.
Put 3 as the next digit of the answer. 
Result so far: 10123.0
The remainder is 60 after subtracting 240 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Let's proceed to step 7:
80 can be fit into 600 7 times, resulting in a remainder of 40.
The number 7 becomes the next digit in our result. 
Result so far: 10123.7
Deduct 560 from 600 and we're left with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Step 8:
When dividing 400 by 80, we get 5 with a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 10123.75
The remainder is 0 after subtracting 400 from 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 9:
When dividing 0 by 80, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 10123.75
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 10:
If we divide 0 by 80, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 10123.75
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The quotient of the division is 10123.75, and the remainder is 0.0.